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The Great Smog of 1952 darkened the streets of London and killed approximately 4,000 people in the short time of four days (a further 8,000 [92] died from its effects in the following weeks and months). Initially, a flu epidemic was blamed for the loss of life.
The Great Smog of London, or Great Smog of 1952, was a severe air pollution event that affected London, England, in December 1952.A period of unusually cold weather, combined with an anticyclone and windless conditions, collected airborne pollutants—mostly arising from the use of coal—to form a thick layer of smog over the city.
Workplace exposure limits exist in places like UK (5,000 ppm for long-term exposure and 15,000 ppm for short-term exposure). [71] Natural disasters like the limnic eruption at Lake Nyos can result in a sudden release of huge amount of CO 2 as well. [74] Because of its role as a greenhouse gas, CO 2 has been described as "the worst climate ...
Inversion-created smog in Nowa Ruda, Poland, 2017 Temperature inversion phenomenon in the early morning near Tawau, Sabah, Malaysia where smoke that was emitted from an oil palm mill stayed close to the ground. The wind carried the smoke in the direction of the nearby settlement to the middle-right of the photo (August 2023).
Industrial pollution can result in dense haze, which is known as smog. Since 1991, haze has been a particularly acute problem in Southeast Asia. The main source of the haze has been smoke from fires occurring in Sumatra and Borneo which dispersed over a wide area.
Hydrogen fluoride and sulfur dioxide emissions from U.S. Steel's Donora Zinc Works and its American Steel & Wire plant were frequent occurrences in Donora. What made the 1948 event more severe was a temperature inversion, a situation in which warmer air aloft traps pollution in a layer of colder air near the surface.
Ground-level ozone is both naturally occurring and anthropogenically formed. It is the primary constituent of urban smog, forming naturally as a secondary pollutant through photochemical reactions involving nitrogen oxides and volatile organic compounds in the presence of bright sunshine with high temperatures. [35]
The Great Smog of Delhi was a severe air-pollution event in New Delhi and adjoining areas in the National Capital Territory of India. [57] Air pollution in 2016 peaked on both PM 2.5 and PM 10 levels. [58] It was reported as one of the worst levels of air quality in Delhi since 1980. [59]